Replacement of Gaskets of 20 MVA Transformer NGEF make installed at 132 KV S/S Chauri under ETD -IV Varanasi

Amount

Following work is to be carried out for replacement of gaskets including other associated work for 132/33 KV, 20 MVA TRANSFORMER-II (NGEF make mfg year 1973) at 132/33KV S/S Chauri with all cost of men, Materials, T&P as per technical specifications for proper completion of the work with due safety & precautions as per direction of the supervising Engineer.

Opening of jumpers of HV/LV side, removal of earthing strip from neutral bushing.

Dismantling of 20 MVA TRANSFORMER-II accessories including radiator, bushing, buchholz relay, oil pipe line from conservator tank to main tank, oil pipe line to OLTC and surge relay conservator tank.

Complete drain out of TRANSFORMER oil from the existing 20 MVA TRANSFORMER-II in to empty oil drums/oil tanker and storage of oil drums at stores/designated place for storage

Replacement of all the gaskets including the top cover, Bushing, inspection cover, conservator radiator, and valves etc. of TRANSFORMER by providing and fixing of new gaskets as per existing size made of rubberized cork sheet Kotika/Turboze/Nu cork brand grade 07 after due fabrication.

Cleaning of Core and winding by TRANSFORMER oil and removal of slug from bottom of the main tank.

Applying vacuum to above TRANSFORMER up to 760mm of Hg for 24 Hrs. with adequate capacity vacuum pumps after necessary blanking/erection as per requirement.

Filling of dry Nitrogen gas having Dew Point(-)60 C to (-)65 C under vacuum from top value of the TRANSFORMER up to pressure of 3 PSI and maintaining the same in the main tank for 12 Hrs including cost of Nitrogen gas and nitrogen gas filling device.

Creating the Vacuum inside the Main tank for period for 12 Hrs. and filling of centrifuged new TRANSFORMER oil in main tank of required BDV after preparation in 20 KL oil tanker.

Complete, erection of 40 MVA TRANSFORMER including radiator, conservator tank, bushing with its turrets along with connecting of all oil pipe line, erection of cooling fans making control cables connection, buchholz relay etc. For completing the work, topping up of TRANSFORMER oil and final oil filling in the tank, radiator, conservator tank and final oil filling in tank, radiator, conservator tank and all other associates.

Centrifuging of following TRANSFORMER oil in TRANSFORMER tank or oil tanker by connecting centrifuging pipes, circulating the TRANSFORMER oil through centrifuging machine and taking BDV values of the oil periodically till the required value achieved as per direction of supervising engineer and also measurement of PPM, all labour, T&P, centrifuging machine shall be provided by contractor at his own cost.

Carriage of 20 KL empty oil tank for the centrifuging of TRANSFORMER oil where it is available within distance of 100 km Approx.

Overhauling of OLTC.

Overhauling of PRV, work includes replacement of damaged/burnout contact and operating plunger.

Conducting BDV, PPM and DGA tests of transformer oil of 20 MVA T/F job includes sample collection of T/F oil in suitable container and its transportation to NABL certified LAB and submitting its test report. First job after completion of work and second job after charging of 15 days.

M/S Shilpa Enterprises

M/S ACCURATE ENGINEERING

RISHAB OIL RECLAIMATION PRIVETE LIMITED